1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Acceleration between two blocks

  1. Feb 3, 2010 #1
    1. The problem statement, all variables and given/known data
    A block of mass m1 = 280 g is at rest on a plane that makes an angle θ = 30° above the horizontal. The coefficient of kinetic friction between the block and the plane is μk = 0.10. The block is attached to a second block of mass m2 = 220 g that hangs freely by a string that passes over a frictionless and massless pulley. Find its speed when the second block has fallen 30.0 cm.
    cm/s



    2. The attempt at a solution

    Mass 1 Mass 2
    Fground=280*9.81=2746.8 N Fm2 ground=220*9.81=2158.2 N
    Fgy=Fgcos(30)
    =433.714 N
    Fgx=Fgsin(30)
    =250.405 N
    Fkinetics=(.1)*(250.405)
    =25.04 N
    Fx= 250.405-25.04= 225.36N

    Fx=max
    225.36=280*ax
    ax=.805 m/s2


    Hopefully this makes sense, but I am not sure if this is all correct and if it is, where to go from here. I'd really appreciate help!
    Thank you
     
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted